At eighteen years of age, she is the oldest member of the group, compared to Marcus Damon who is fourteen years old and Thomas H. Norstein who is roughly the same age. Yoshi is independent and sees herself as an older sister figure to her two teammates. Her catchphrase is, "This is the worst!".

Despite her mature demeanor, she hides a terrible burden from her childhood, and, because of it, she has difficulty believing in her ability to do anything. When she was younger, she dealt with a severe inferiority complex that stemmed from being unable to be as good as her sisters at anything (the most noteworthy incident was a piano recital). As a result, years later, she still is secretly worried about being useless to anyone. Lalamon had been aware of her suffering for some time and helped her to overcome it. The fact became apparent when she started to feel she was useless to Marcus and Thomas since her Digimon was easily beaten in every single battle they took part in, but she eventually gained her own confidence, which allowed Lalamon to warp digivolve to Lilamon.

Her partner is Lalamon, and she is quite friendly. Lalamon says her name when she comes out of the digivice.

Five years later, she becomes a police officer as she pursues Kouki on a motorcycle.